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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95295708a5991990b5a2246be9414e4cd44c15a287965f421b33fc36419dc0eb' 
  AND token = 'R5TQBoGxTB0MwP8QTggo+k8xBZXKLKUD1/SW5JexDgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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