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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df98441ef67e4b3078d87a9279a01bd7f6041b261602a9e5c6883d99b9bcb6a6' 
  AND token = 'Pi5A10WigG2K+WX6AX5PMJqdA8tYPHKePvK6Q5ZzzYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00079

JSON explain

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