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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '110736f43d11c4ec8add39aceea1363a0cf688035b1c79c46241aef509ab141b' 
  AND token = 'azcg+ngWH82FUzoSThD8EOijVJ5t4yHim22cp3qBlfI=' 
  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"
    }
  }
}