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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcb44783c6c0676a0ad813c2a1cc15215e03f2c7082d7efa180c73aeaaabbee2' 
  AND token = '2cctlW4WgkBRc6EVja9yMQgZ7Fpcquq5vbSdlvuQCZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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