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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd18412053aa6975fe7ba62d71125a37661ec4a34721932d5d9d22bc239304787' 
  AND token = '0zrUHPi4/6f8s9NIaxqTKMkS0/BWeagS5WIY4DDAQIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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