SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1a196996855cc89843c1fef76ddd4767ab2ab4da487921725f258c7c3474faa' 
  AND token = 'kjQm6nj8sV+ZdixXZLB66aJhDg+5b+6toRYP3P4ZeSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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