Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adeea00f1d1321782fd2fab987e947784b790f2bcb2ff86930c5396e1af2ba94' 
  AND token = '/mAAS0Nk/G1OZk7RYhvpWohWX0gIyCuWHS+LHWDTGxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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