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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfe7b5e06c6425275ddd6044d9cade1f09218d874a9a430c8475e89927245add' 
  AND token = 'IBVsdmzueAxfxKBqwWm0GWs+2MdG1WUlOtDxTz2tEOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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