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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '301f973ceb7d925d550cdd153d7c6170d146820eaceadefdec640618c6fcf844' 
  AND token = 'QR3bVBzV/cRAxvQ+5N0xhbq8OJ156ylpgDBmN0YSJHI=' 
  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"
    }
  }
}