Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8911979da9f5be32eed3a6f87c0bbe6b2e3e17e1ba7e5755d988bb753da4f18d' 
  AND token = '08BGxdcvuVD2aSLZ7PYr8SHReCDxxRUpWVUtPEcs3VY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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