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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1708df9a29b87b6b783dc5b585561ea6c62d9e698fdd81b5b355e0df1115eae' 
  AND token = 'LS9I7u7WfddYO/tUmJqtwBMXEHbN4LxhdjeNBuK56q4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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