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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7646eaeeb4a44ba56eb3baf87e1743c613b6ff96ca8f17d88a0a09f940609a8f' 
  AND token = 'CCztYosFyn0iU9tr1wrnuWL+mx8thhUvvU/ao8vuKMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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