Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df00f67852f52cf4f7fd36092bb0e51e21b3b990cfbfdc4df68a7599b1f3532f' 
  AND token = 'qQ/TImFC0bubEmLG33QDyeWJuPPdmi7cmoeWT3LVI+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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