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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df82908c5b9f660a66f7e559640ab3ec5feae6eed986e09fff085650bcdaf0c8' 
  AND token = 'hCvgnHTy1/dYqVthTyGCl6nASNIf11BFWrr0QPkEkcI=' 
  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"
    }
  }
}