Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '060f19ead327dda19c76ba0cc16a8757803bd1c981b8f5804c9cb39babd5921e' 
  AND token = '5PARtJ1ZNPIjMkCpLoEiM9bR4noSI75uXTuP3mQEMPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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