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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '505c1c4ef3c2009cdec8ea75a08a20e5ca319adc0c5d35701705b8bfaa71fb3c' 
  AND token = '+j0eg6KU47gGzAOs3lCMZo42KAqUMyHXUMDU1eSYXiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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