SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22fb98c5395c8c6841de0c2bbb87d84b18166d45bd88d3c960ffde7f6024e6a6' 
  AND token = 'QeVz1DA/4iCzqaKpJLksLVRmBq8RhfLEJ0gRDJGp7y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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