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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33195683dcc3838e8fee7631ab3f01028afc557b96c0161f3707f298f6d9bf95' 
  AND token = 'fxG2t0Z48akcPpi9rl1ZCSUZoCC3p1Y8jA+SdIROKbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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