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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ed2b92159d9e1065ffb9e2547197718ba57f8cbafbfe31ee37294ffb6603b35' 
  AND token = 'e/EIkKSwu61eWCbkbv/zdwHuZ95u611lIzvCnZg3Akg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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