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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1d614b2c5c3911a7ce1217eef38b2ad8c36f7bb92c263f0e904e0e4426a05af' 
  AND token = '7Al7EX/6RX6Hlcqhg03jtd/wzHJXmCnhVgDSVq7vLa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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