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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bea2da521bad16d43105b5f03fd8a929c09b2df07d6d7eb8169ff8a61d43186e' 
  AND token = '44j33sQ9S5zlol9F6XzBBulTGiMYce0ezDAMRwDwx0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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