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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cde8e3d4a5119d17c8bd880fd891f975c096552fa7d58570abd79277ae044d99' 
  AND token = 'm0ayMyWGqEQhIiBp+x6QhRlg0k396CQgxVLwEwOL4f8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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