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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32577a6d6aa5be97f66d4c967fb9ec56958439d941c3688abba7bcce538581a4' 
  AND token = 'VGYyeQMYK3AitP50iCazZmLghV5hKbru8MSgmGd9c/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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