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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85944caf60b06c6f974a05ad3998c2af1d6f659c59222dd4da88330efa7c1fd1' 
  AND token = 'w/GjMgpRz2X1SFjoQDnC966nny0dmMzNq0TNr03p5Fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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