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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b587b1163bad6b029f9efb4af2cb588ed2b6a2554a8f55445c9d1ab68e7cad7' 
  AND token = 'nxekoxty6JEB342HXdhE/Ot65IUxAJHunXVwaRDtvOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}