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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1df4bf8b0dc2472e6b147a01868ad8554edfee9f363212d5b645e1375a4c3343' 
  AND token = 'rPapz/Ls5TpsUb4vlOwaHcXRTW/Um1gUx1UZ+JJFne8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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