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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c53716327d96bb6d2742c69fa23a7ea6f55a3c2a2f71738ad7d3b9db6d14761' 
  AND token = 'NqpkctrswPGQ51jQKj59BA3CuooMWspaNKdt4q3FL5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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