Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9c5dea0c514bf4713d8526711df7e9eafa0020fa776d8f658198cdb3f6e92af' 
  AND token = 's6k+BienPXSFBTQpS5KpBs1vIaJbzyR94F7wp4jV8I4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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