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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54622c1dfc921a324bd8081bfd78bf4cf5ea33dbadf74fb930de57e0907bc196' 
  AND token = 'aJQQaIKNzxkx29e6ED6pxX/CDFdOX1G/Xy6o1IyVn/M=' 
  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"
    }
  }
}