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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3724f55f9bf600396c8026b4c33b213b4ed6141a674963c91086f70cf7833364' 
  AND token = 'MxGxseLqGdqF5fvC3k7wIqQaTiSUo+W+QmITeckaS0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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