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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d25d55e509e8bb9baf621bc70c157482c7797258f2b1fc35e8476d77da17dc4' 
  AND token = 'lZiGVfn011yo8CI8AFL6OhJIf5pRZjtG0mgES6HDOG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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