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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13fad39be36bd03c9b6fda59ce9027830d916174166b8d6e1e527b2d9083719a' 
  AND token = '0/sDXaSqPYx+TqJigGdURjHjiAMEtW1l4M+DxtxL874=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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