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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1215df4bfc4b4b1b5489fb4d53b963c83af1cbecad93f2cb62ea0c956365541e' 
  AND token = 'whcj2xL7JGZd7f3HUkjDoeWS4MffdRC0L3qrHX/Srm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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