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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '445c8069f733434d0cb438cc1ccec0d4f8f9b125e5d12abdcb5f359bd60605e3' 
  AND token = 'wVWklbqRrPVG9W54ojn2Lad5wkf2keWg86SbE4KC978=' 
  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"
    }
  }
}