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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea39a4bc615c47ef25e66aa3629c685ac556c24aa4a4d713b404c1e81454dd43' 
  AND token = 'J3z5mB3OKKIOBB2+0THGl3YJpTwlq5rCHRMO9STZoU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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