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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b6f5d235e7176d9ad43ca3e21e66b593cf1f6228d52b3a5b902630f238c04dc' 
  AND token = 'aed33dI5sXLGURKUq5UzAsIxeUe6zMDHF1eXsRlfqMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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