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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f809e1415c25c7cf30f6c930825eba4edba21361084ec0da21e117e8b90f5eb' 
  AND token = 'YzlSD5o8lEoi1BCgUHUrlenQoUxd2mcx0wM7QScGus4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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