SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fe57f11200b269b84af8fd587482046392b5885580bf1d000c199101c81f336' 
  AND token = 'tAfNjG7YVR3qa6pqu5GIvj+wyvrBzdrVzqoR3OMx+5g=' 
  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"
    }
  }
}