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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67965bea4771b7e439b6899bb8361c67dfae3a8773d1290228d83e7590f19083' 
  AND token = '2hb3AkfStOQY57a01IpVXG2NVKyIq+TF7Zu5mmy7lJ4=' 
  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"
    }
  }
}