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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3616c24047c9efd167f338d74b4d8a0d76d4e8b26b9b8c7a93ed9b76b0282f2' 
  AND token = 'i4VEBf1U7ksinEcmREhhvQhaeb5RWrwE/+lic6PPF0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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