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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac7028f30874ae1353af58b1a95e314483420217a4c63bf36b67cf62e80b1255' 
  AND token = 'TUVRqtqxf24oqtaDqE3G6fHh3QjcpPzf4zbBJxupZxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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