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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe1ea1ce06c68c659ab28b7c63c27c40632cbf44b41c99271f1044ffb3d1911f' 
  AND token = '/A/vDBGtpaG4lp/Pn6M0Txo50uH7Gws/qkz6g0LMbsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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