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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a0ed6e878ffd21a4a4ce8eb217e2e6cb1489b20dff8a4537072e562c7be44e6' 
  AND token = 'c9t2aM2DaghyNIA1xypKLHMl0qxvVueBktYOAXknCv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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