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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9abf7125ebd120f06d348041b59f1ec848921ce791fa13e918e55425f75568ad' 
  AND token = 'H+I9oX4oP1rsOrN4YtbpCZOAshn7RH2Hj45/tkFbWaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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